[U-Boot] [U-Boot, v2, 05/27] mkimage: Show an error message when usage() is called

[Tom Rini]

On Mon, Feb 22, 2016 at 10:55:37PM -0700, Simon Glass wrote:

> Sometimes incorrect arguments are supplied but the reason is not obvious to
> the user. Add some helpful messages.
> 
> Signed-off-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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